Answer: C. Answers A, B, and D are incorrect because 0100 does not compact to 01. Answer B is also incorrect because 0010 does not compact to 001.

Q17. When using the dual-stack backbone, which of the following statements is correct? a. The backbone routers have IPv4/IPv6 dual stacks, and end hosts do not. b. The end hosts have IPv4/IPv6 dual stacks, and backbone routers do not. c. Both the backbone routers and end hosts have IPv4/IPv6 dual stacks. d. Neither the backbone routers nor end hosts have IPv4/IPv6 dual stacks.

Q18. How does a dual-stack host know which stack to use to reach a destination? a. It performs an ND, which returns the destination host type. b. It performs a DNS request that returns the IP address. If the returned address is IPv4, the host uses the IPv4 stack. If the returned address is IPv6, the host uses the IPv6 stack. c. The IPv6 stack makes a determination. If the destination is IPv4, the packet is sent to the IPv4 stack. d. The IPv4 stack makes a determination. If the destination is IPv6, the packet is sent to the IPv6 stack.

Q19. What protocol numbers are used by Ethernet to identify IPv4 versus IPv6? a. Protocol 6 for IPv4 and protocol 17 for IPv6. b. 0x86DD for IPv6 and 0x0800 for IPv4. c. 0x8000 for IPv4 and 0x86DD for IPv6. d. 0x0800 for both IPv4 and IPv6; they are identified in the packet layer.

Answer: B

Q20. Which of the following describes the IPv6 header? (Select two.) a. It is 40 bytes in length. b. It is of variable length. c. The Protocol Number field describes the upper-layer protocol. d. The Next Header field describes the upper-layer protocol.

Answer: A and D

Q21. Which of the following is true about fragmentation? a. Routers between source and destination hosts can fragment IPv4 and IPv6 packets. b. Routers between source and destination hosts cannot fragment IPv4 and IPv6 packets. c. Routers between source and destination hosts can fragment IPv6 packets only. IPv4 packets cannot be fragmented. d. Routers between source and destination hosts can fragment IPv4 packets only. IPv6 packets cannot be fragmented.

Answer: D. IPv4 packets can be fragmented by the sending host and routers. IPv6 packets are fragmented by the sending host only.

22. A packet sent to an anycast address reaches what? a. The nearest destination in a set of hosts b. All destinations in a set of hosts c. Broadcasts to all hosts d. Global unicast destinations

Answer: A. Anycast addresses reach the nearest destination in a group of hosts.

Q23. Which of the following is/are true about IPv6 and IPv4 headers? a. The IPv6 header is of fixed length, and the Next Header field describes the upper-layer protocol. b. The IPv4 header is of variable length, and the Protocol field describes the upperlayer protocol. c. The IPv6 header is of fixed length, and the Protocol field describes the upperlayer protocol. d. A and B e. B and C

Answer: D

Q24. An organization uses an IPv6 address range that it received from its ISP. The IPv6 addresses will be used internally, and employees will access the Internet using Port Address Translation. What is required for DNS? a. DNS servers need to support only IPv4 addresses. b. DNS servers need to support only IPv6 addresses. c. No changes are needed to the DNS servers. d. DNS servers need to support both IPv4 and IPv6 addresses e. Additional DNS servers for IPv6 addresses are needed. f. DNS servers are not needed for PAT.

Answer: D

Q25. Which statements about IPv6 addresses are true? (Select two.) a. Leading 0s are required. b. Two colons (::) are used to separate fields. c. Two colons (::) are used to represent successive hexadecimal fields of 0s. d. A single interface will have multiple IPv6 addresses of different types.

Answer: C and D

Q26. You have duplicate files servers at multiple locations. Which IPv6 address type allows each end station to send a request to the nearest filer server using the same destination address, regardless of the location of that end station? a. Anycast b. Broadcast c. Unicast d. Global unicast e. Multicast

Answer: A

Q27. Which strategy allows both IPv4 and IPv6 addressing/stacks to coexist on a host to facilitate a migration? a. Deploy NAT-PT between the networks. b. Hosts run IPv4 and router run native IPv6. c. Enable anycast in the routing protocol. d. Run both IPv4 and IPv6 address stacks on devices. e. Redistribute between the IPv4 and IPv6 networks.

Answer: D

Q28. Which strategy would be most flexible for a corporation with the following characteristics? 2,400,000 hosts 11,000 routers Internet connectivity High volume of traffic with customers and business partners a. Deploy NAT-PT between business and Internet networks. b. Hosts run IPv4 and router run native IPv6. c. Both hosts and routers run dual stack. d. Enable anycast in the routing protocol. e. Redistribute between the IPv4 and IPv6 networks.

Answer: C. Running dual-stack IPv4 and IPv6 on hosts and routers allows for full flexibility for communications for the corporation internally, with partners, and with the Internet.

Q31. In a network where IPv6 exists within an IPv4 network, which two strategies allow both schemes to coexist? (Select two.) a. Translate between the protocols. b. Hosts run IPv4 and routers run native IPv6. c. Encapsulate IPv6 packets into IPv4 packets. d. Enable anycast in the routing protocol. e. Redistribute between the IPv4 and IPv6 networks.

Q33. Which statement best describes the efficiency of the IPv6 header? a. It is less efficient than the IPv4 header. b. It has the same efficiency as the IPv4 header; the larger IPv6 address makes it faster. c. It is more efficient that the IPv4 header. d. It is larger than the IPv4 header.

Questions 36 through 39 are based on the following scenario and Figure.Figure: Company Adds Sites A and B A company has an existing WAN that uses IPv4. Sites C and D use IPv4. As shown in Figure, the company plans to add two new locations (Sites A and B). The new sites will implement IPv6. The company does not want to lease more WAN circuits.

Q36. What options does the company have to connect Site A to Site B?

Answer: Implement a dual-stack backbone, or implement IPv4 tunnels between the sites.

Q37. What mechanism needs to be implemented so that IPv6 hosts can communicate with IPv4 hosts and vice versa?

Q52. What changed from the IPv4 header to the IPv6 header? a. Protocol Type became Next Header field. b. ND is used rather than ARP. c. AAAA records are used rather than A records. d. All of the above.